Downpipe Question Please Help ASAP.

I just bought a new down pipe and its 3" and i was wondering if its going to fit on my stock cat-back, if not what kind do to make it fit with stock Cat-back.

Thanks

It'll fit.

I also replaced the pre-cat and now have a high flow single cat on it. I'm thinking of putting headers on too. Still have the orginal exhaust from the new cat back. But it sound nice.